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1) i can listen to cd music
i open kde-multimedia-xmms
i open a .mp3
and it says
please check:
you sound card ins configure properly
you have the correct output plugin
no other program is bloking sound card
but i can listen to youtube video
and i run alsaconf and configure my sound card

The answer is right in front of you. What happened when you configured your sound card? DO you have the output as well as the type of soundcard you may have ?